How many gods of death are there?

Western Biblical mythology, the fallen angel Lucifer is the god of death (probably very similar to what you said sickle death)

Traditional Chinese Taoist mythology, naturally, is the hell of the ten Yanluo heaven, the black and white changeless, and so on (said changeless is a hook sickle hook messenger is also somewhat similar)

Greek mythology, the god of death, Thanatos (Thanatos), is the son of the god of the night, like to wear black cloak, holding a deadly sword, walking at night in the crowd's habitat, the god of death, the god of death, the god of death. Wielding a deadly sword, he walks at night in the abode of the crowd. (In fact, this so-called deadly sword is now said to be the scythe, at that time was considered to be a kind of curved sword, this is probably the owner of the god of death is also the most orthodox posture of the god of death)

Egyptian mythology, the messenger of the underworld is probably the owner of the Anubis said... But he didn't have a scythe (he had a tin staff) and he was a werewolf-headed man.